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提出一种选取运行方式集合分析光伏电源接入孤立电网后稳定性的方法。本方法先穷举该电网所有的开机组合,再基于经济性原则,筛选掉部分开机组合;根据电源和负载需求情况确定电网可能出现的最大、最小负荷,并在最大、最小负荷之间均匀地选取若干典型负荷值,同时选择与之相适应的开机组合;在适当考虑系统的旋转备用后,最终构成运行方式集合。根据形成的运行方式集合,再采用相应的仿真计算,能更全面地分析光伏电源接入孤立电网后存在的稳定性问题。应用实例证明了该方法的有效性。“,”This paper presents a method of selecting operation mode sets to analyze the stability of isolated grid with PV connected.Firstly,the method exhausts all unit combinations,and screens out some unit combinations on the basis of principle of economy.Secondly,according to the power supply and load demand,it determines the possibly maximum and minimum load of the grid.Thirdly,it selects several typical load values evenly between the maximum and minimum load,as well as the unit combinations adaptable to the selected loads.Furthermore,in order to ensure the safe and reliable system operation,it also needs appropriate consideration of system spinning reserve.Finally,the operation mode sets are formed,whereby the corresponding simulation calculation is made for a more comprehensive analysis of stability issues of isolated grid with PV connected.Application examples demonstrate the effectiveness of the method.